Portable air-pump.



N0. 635,674. Patented Oct. 24, |899. A. B. mss. PORTABLE AIR PUMP.

(Application led July 19, 1898.) (No Model.)

...l gli 7e HUMMER rn STATES ALBERT B. DISS, OF NEW YORK, N. Y.

PORTABLE AIR-PUMP.

SPECIFICATION forming part of Letters Patent No. 635,674, dated October 24, 1899. Application filed July 19, 1898. Serial No. 686,351. (No model.)

To all whom it may concern:

Be it known that I, ALBERT B. Diss, a citizen of the United States, residing at the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Portable Air-Pumps, of which the following is a specication.

My invention relates to improvements in portable air-pumps for inflating pneumatic tires, particularly the tires of cycles, the object of my invention being to simplify the construction and reduce the cost of manufacture and at the same time to increase the efficiency of the pump.

In carrying out my invention I employ a cylinder, a piston, piston-rod, and handle, as usual. The heads in the respective ends of the cylinder are each provided with cupleathers bearing against the smooth inner surface of the cylinder to insure a tight joint. The stationary head is held to the cylinder by a pin or screw, which atthe same time secures the foot-strap to the lower end of the cylinder. The other cylinder-head is removable and is formed with a screw-thread which engages a similar screw-thread upon the upper end of the pump-cylinder. The heads are each provided With inlet-valves for air in chambers of peculiarconstruction. Acouplerisconnected to the fixed headof the pump, and thev airpassage therein coincides with an air-passage in the stationary head, and a tube outside of the cylinder connects the coupler with the case of a double-acting valve, and from which` case extends a rubber tube that is terminated With a coupling for the valve of the pneumatic tire. The case of the double-acting valve is of peculiar construction. This valve is the only one employed in the pump in addition to the inlet-valves in the respective heads. This valve is a flat piece of leather or other suitable material, and seats are provided in the case at the ends of the tubes and upon opposite sides of the leather, the valve going to a seat in either direction, according to the movement of the piston in the cylinder, the pump being double-acting and consequently forcing air with each movement of the piston.

In the drawings, Figure l is a front elevation representing my improvement. Fig. 2

is a side elevation of the same. Fig. 3 is a section at the respective ends of the pump. Fig. 4 is a sectional plan at the line m at of Fig. 3. Fig. 5 is a sectional elevation at the line y y of Fig. 4. Fig. 6 is a vertical section of the double-acting valve and its case. Fig. 7 is an end elevation of the same. Fig. 8 is a sectional plan at e e of Fig. 6, and Fig. 9 is a plan of the upper cup-leather disk. Figs. 3 to 9, inclusive, are on the same scale and of exaggerated size.

The cylinder a is provided with a screwthread at the upper end, preferably pressed in the sheet metal, as shown at a', into which the head o is screwed, and the head b at the lower end is preferably slipped into the cylinder and secured by a cross-pin d, which may be riveted up or screw-threaded, and it is also made to hold to the outer sides of the cylinder the foot-strap d, such pin cl' passing through the upper ends of the foot-strap, and these are bent to it the exterior surface of the cylinder.

It is necessary to make the respective heads air-tight in the cylinder, and with this object in view cup-leathers are introduced, secured by disks within the cupleathers that are screwed to the heads. The cup-leather c and disk c2 are represented as connected with the upper head c, and the cup-leather b' and disk b2 are represented as connected with the bottom head b.

The piston-rod e' passes through the head c, and it has a handle e2 at the upper end and the cup-leathers e set in reverse position upon the piston and are secured in position by disks within the cup-leathers, as usual, so that this air-pump is double-acting, and the drawing Fig. 3 illustrates the parts in the position they will assume if the piston and cup-leathers e are moving in the direct-ion indicated by the arrow.

Through the I disk b2, cup-leather b', and head b is an opening or port l0, leading to the coupler f, which is in the form of an elbow screwed into the head ZJ, and the washer at f makes a tight joint, and there is a tube eX- tending from the coupler f to the valve-case h, which tube g is advantageously of indiarubber slipped upon the enlarged tapering ends of the coupler f and valve-case h, so as IOO to allow the air to pass through the port or exits l0 and 1G to the passage 12 in the valvecase h.

The valve-case 7L opens through the side of the pump-cylinder a, and it is advantageously rigidly secured to the cylinder by rivets or screws, there being an intervening washer at 7L to make the parts air-tight.

Extending out at one side of the valve'case 7L is a branch h2, receiving upon it atube which is advantageously flexible, as shown at t, Fig. l, leading tothe valve-case or coupling of a pneumatic tire, so that the air from the pump is delivered through the pipe t', and in this branch 712 is a valve-chamber 13, which is flat and contains the valve 7s, formed of a strip of leather or similar flexible material, the valve-chamber being slightly larger than the valve, and the metal at the end of the branch is in the form of lips 20, which are pressed together by hammering or otherwise after the valve 7i; has been slipped into place; but there are air-channels at each side of the lips, as seen in Fig. 7, for the free passage of the air. It will now be understood that the valve 7a closes either upward, as seen in Fig. G, or downward, according to the direction in which the air may be moving, the valve closing upward as the piston is pressed down and closing downward as the piston is drawn up, so that by this improvement the one valve becomes double-acting, and it is not liable to get out of order, because it is held loosely in a valve-chamber that is approximately the same shape as the valve, but slightly larger. Hence the valve cannot become misplaced and will close upward or downward, and there is no wear upon the same or any valve-stem or other guide for the valve, and if the valve becomes injured it can be withdrawn by simply bending back the lips 20, and another strip of leather or similar material,cut to the proper shape, can beinserted in its place. The ends of the air-pipes, opening in opposite directions into the valve-chamber, form the valveseats, and the diameters of these seats is less than the width of the valve-chambers.

I provide inlet-valves in the respective heads b and c, there being straight holes passing through the respective heads and through the cup-leathers and disks; but each valve is in an enlarged chamber and advantageously circular, so that the valve will seat itself at the end of the opening or port. I have shown an opening or port G through the head b and the circular valve 4, of leather or other material, within the enlarged chamber 5 and the hole 9 through the head c and the valve 7 within the enlarged chamber 8, so that it may seat itself upwardly by the action of the air-pressure- If these parts only were made use of, the respective valves would open and then immediately close in their chambers. To avoid this, there are two adjacent holes made through the respective cup-leathers and disks, as seen in Figs. 5 and 9, one hole being in line with the hole through the head and the other hole near the same and passing down and opening laterally into the valve-chamber, as seen in Fig. 5, the hole 22 forming an airpassage when the valve is open, so that the valve for each head can rise or fall freely in its chamber, and when pressed outwardly the valve closes and retains the air in the cylinder and when drawn inwardly the valve is moved from its seat and the air passes freely by the lateral passage 22.

Upon reference to Fig. 3 it will be seen that the piston-rod e has around it and within the head c a chamber that tapers upwardly, and in this chamber is a packing 2, and the helical spring 3 intervenes between the packing and the cup-leather and tends to press the packing into the tapering chamber, and this packing acts in the same direction as the airpressure. Hence it makes a tightjoint around the piston-rod c and it is self-adjusting, and should it become worn and leaky it is only necessary to introduce a ring of leather or other yielding material around the piston-rod and against which the spring can act in forcing the same into the tapering chamber.

I claim as my inventionl. The combination with the pu mp-cylinder, piston and pipes extending from the ends of the cylinder and forming air-passages that are in line and lead in opposite directions, and an air-exit pipe forming a branch, there being a at valvechamber between the pipes that come in opposite directions, and valve# seats directly at the ends of the pipes, of a iiat flexible valve in such chamber narrower than the width of the chamber, but Wider than the valve-seats at the ends of the pipes, substantially as set forth.

2. The combination with the pump-cylinder and piston and the pipes extending from the ends of the cylinder and forming air-passages and valve-seats directly at the ends of the pipes and standing in opposite directions, and an air-exit pipe, there being a valvechamber between the pipes and valve-seats, such chamber being iiat but wider than the valve-seats, of a iiat flexible valve in such chamber :narrower than the width of the chamber, but wider than the seats, and means for holding the valve at one end to retain it in position, substantially as set forth.

3. The combination with the piston, its rod and the pump-cylinder, of a head through which the piston-rod passes, there being a recess in the head around the piston-rod which is tapering with its smaller end outward, a packing within this recess and a spring around the piston-rod for pressing the packing outward and automatically packing the pistonrod, substantially as set forth.

4. The combination with the cylinder, piston and rod in a pump, of a tubular valvecase permanently connected near one end of the pump, a branch forming a valve-chamber and an air-exit, the valve-seats being directly at the ends of the pipes, and a liat valve in the said chamber, a tubular coupling-elbow IIO connected with the other end of the cylinder and a flexible pipe attaching the couplingelbowv to the open end of the tubular valvecase, substantially as set forth.

5. The combination With the cylinder, piston-rod, double-acting piston and inlet air- ValVes, of a tubular connection between the two ends of the cylinder, a lateral branch through which the air is delivered, there being a iiat Valve-chamber and a Valve therein formed ofa flat strip of leather of similar material and smaller than the Valve-chamber, so that the'air-exit will be open, but the Valve will close in either direction according to the movement of the air,substantially as set forth.

6. The combination With the cylinder, piston-rod, double-acting piston and inlet airvalves, of a coupler or bend connected with one head and forming an air-passage, a valvecase connected with the cylinder near the other end thereof, and a connecting-tube, there being a lateral branch to the valve-case for the air-exit and a flat chamber therein, and a Valve in the chamber formed of a strip of leather or similar material and smaller than the chamber,'there being lips at the end of the branch for retaining the valve in position, substantially as set forth.

Signed by me this 12th day of July, 1898.

ALBERT B. DISS.

Vitnesses:

DANIEL W. Diss, JAMES CoNKLING. 

